Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...39...23s&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 39, Jan. 1980, p. 23-28. Research supported by the University of Victoria an
Astronomy and Astrophysics
Astrophysics
1
Eclipsing Binary Stars, Lyra Constellation, Stellar Spectrophotometry, Emission Spectra, Light Curve, Line Spectra, Tables (Data)
Scientific paper
Observations of Beta Lyrae (with HR 6997 as the principal companion star) are presented, principally of certain strong lines and neighboring continuum regions obtained through interference filters of bandwidths ranging from 27.0 to 33.7 A. Light curves in the 3 blue and 3 red bands are shown, and color indices and emission intensity indices are tabulated. Moreover, a photometric index of emission line strength, analogous to the spectroscopic index of Batten and Sahade (1973), is derived. It is suggested that the H alpha emission comes from a larger region around the binary star than does the helium emission and is asymmetrical, being weakest near quadrature when the primary star is approaching earth. The helium emission, by contrast, is more symmetrical, and varies with binary phase by a larger fractional amount.
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